Analytical Chemistry Question 203
Question: To a solution of a substance, gradual addition of ammonium hydroxide results in a black precipitate which does not dissolve in excess of $ NH_4OH $ . However, when $ HCl $ is added to the original solution, a white precipitate is formed. The solution contained
[BHU 1973]
Options:
A) Lead salt
B) Silver salt
C) Mercurous salt
D) Copper salt
Show Answer
Answer:
Correct Answer: C
Solution:
$ Hg_2Cl_2 $ is white insoluble salt. $ Hg_2Cl_2+2NH_4OH\to \underset{\begin{smallmatrix} \\ \end{smallmatrix}}{\mathop{\underbrace{Hg+Hg(NH_2)Cl} _{Black}}}+NH_4Cl+2H_2O $
BETA
